Here is an explanation of secularism, Christianity and religious peace that is fascinating. Plainly, the wealthier (and more educated a society), the less likely religious institutions will claim power - of a particular sort. Wolfe notes, at the end, that megachurches are how people organize in the US. But religious values (frugality, etc) beget and end to religious observance.
Alan Wolfe in the Atlantic writes: "Yet breathless warnings about rising religious fervor and conflicts to come ignore two basic facts. First, many areas of the world are experiencing a decline in religious belief and practice. Second, where religions are flourishing, they are also generally evolving—very often in ways that allow them to fit more easily into secular societies, and that weaken them as politically disruptive forces. The French philosopher Blaise Pascal once famously showed that it would be irrational to bet against the existence of God. It would be equally foolish, in the long run, to bet against the power of the Enlightenment. The answer to the question of which religion will dominate the future, at least politically, may well be: None of the above....
...But intellectual fashions are fickle, and the idea of inevitable secularization has fallen out of favor with many scholars and journalists. Still, its most basic tenet—that material progress will slowly erode religious fervor—appears unassailable. Last October, the Pew Global Attitudes Project plotted 44 countries according to per capita gross domestic product and intensity of religious belief, gauged by the responses to several questions about faith (a rendition of the Pew data appears on the opposite page). The pattern, as seen in the Pew study and a number of other sources, is hard to miss: when God and Mammon collide, Mammon usually wins....
...In 19th-century Europe, as Weber’s reference suggests, religious devotion did make people better off materially, and thereby moderated godly fervor. Just because it may have happened that way then does not mean that religion will have the same effect in the developing world now. Yet whether it is faith or some other force that stimulates economic growth in Africa (or Asia or the Middle East), growth is bound to occur, and to continue to moderate religious fervor....
....But one shouldn’t go overboard in describing American religiosity. For one thing, it is as shallow as it is broad: Americans know relatively little about the histories, the theological controversies, or even the sacred texts of their chosen faiths. Recent decades have seen the rise of the Christian right in the United States, but they have also witnessed the seemingly inexorable advance of secular ideals, such as personal choice and pluralism, that blossomed in the 1960s. Some signs indicate that the Christian right may be losing steam, or at least moderating, as a political force. Nonbelief, meanwhile, is increasing: not only are atheist manifestos selling in large numbers, but the percentage of those who express no religious preference to pollsters doubled between 1990 and 2001, to 15 percent.
The most important religious phenomenon in the United States, however, has nothing to do with the number of atheists. It concerns another trend that, like modernization, is changing the trajectories of religion worldwide: the creation and spread of a free religious marketplace, which partly (though by no means completely) revives religious devotion wherever it reaches, but also tends to moderate the religions offered within it....
But secularism is not the opposite of belief; nonbelief is. Indeed, secularism has religious, specifically Christian, roots; it renders unto Caesar what is Caesar’s, while leaving to God what properly belongs in his realm. John Locke argued as much in A Letter Concerning Toleration, first published in 1689: genuine salvation, he wrote, can never be achieved through governmental coercion. In contemporary societies influenced by Lockean ideals, then, religion’s priority of belief and secularism’s commitment to individual rights are not in opposition; rather, they complement each other. It was once thought that the First Amendment was written to protect public life from the depredations of religious orthodoxy. It is now commonly accepted that the Founders also separated church and state in order to protect religion from government....
So what happens to religions that find themselves with many competitors? Consider what is occurring within the growing American evangelical movement. It has built megachurches that meet the needs of time-pressed professionals by offering such things as day-care centers, self-help groups, and networking opportunities. Its music owes more to Janis Joplin than to Johann Sebastian Bach. Its church officials learn more from business-school case studies than from theological texts. And its young people—well, as the children of parents who have gone through a born-again experience, they are not likely to be as obedient as the evangelical leader James Dobson wants them to be. Having opted to grow on secular terms, American evangelicalism is becoming less hostile to liberal ideas such as tolerance and pluralism. New efforts to take it in directions sympathetic to environmentalism and social justice are a direct result of the maturing of the faith, which followed from earlier decisions to make the movement more appealing to large numbers of Americans, especially the young.